适用于连续档装配式架线施工的线长精确计算方法

Precise Calculation Method of Wire Length Suitable for Continuous Span Prefabricated Stringing Construction

线长的精确计算是保障连续档装配式架线施工质量的关键。针对现有方法忽略连续档各档应力差异导致线长计算不准确的问题,改变单一导线应力计算连续档线长的传统思路,将连续档各档应力精确求解,提出了一种适用于连续档装配式架线施工的线长精确计算方法。首先考虑塑蠕伸长对导线的影响,使用状态方程计算施工工况的架线应力。然后采用基于滑轮悬挂架空线条件下的应力求解算方法,实现各档导线应力的精确求解。最后综合计算耐张绝缘子金具串、杆塔挠度等因素对连续档耐张段线长的影响并进行线长调整,获得连续档架线线长。所提方法已在广东江门某220kV输变电改造工程中成功应用。

Accurate calculation of wire length is the key to ensure the construction quality of continuous span fabricated stringing.Aiming at the problem of inaccurate calculation of wire length caused by the existing method ignoring the stress difference of each span of continuous span,the traditional idea of calculating the wire length of continuous span by changing a single wire stress,and the stress of each span of continuous span is accurately solved.Accurately calculation method for the construction wire length of continu-ous span fabricated stringing is proposed.Firstly,the influence of plastic creep elongation on the wire is considered,and the state equation is used to calculate the wire stress in the construction condition.Then the stress calculation method based on the condition of the wire suspended by the pulley is used to realize the accurate solution of the wire stress of each span.Finally,considering the influ-ence of factors such as tension insulator hardware string,tower deflection and other factors on the wire length of the tension section of the continuous span and the adjustment of the wire length to obtain the wire length of the continuous span.The proposed method has been successfully applied in a 220 kV power transmission and transformation project in Jiangmen,Guangdong.